Add all of the spices to a small bowl and mix thoroughly until everything is evenly combined.
3 tbsp dark brown sugar, 1 tbsp ground cumin, 2 tsp kosher salt, 2 tsp smoked paprika, 1 tsp black pepper, 1 tsp dried oregano, 1 tsp garlic powder, 1 tsp crushed red pepper flakes, ¼ tsp ground nutmeg, ¼ tsp dried thyme, ¼ tsp dried rosemary